Banknifty April expiry future today closed at 15700 with loss of 560 points. I already told this that before moving upward banknifty might test 15500 support. On downside 15500 is major support and important on weekly closing basis. Above it risky traders can take contra long call onnear 15500 with strict stop loss for swing targets 16900!!! Option traders near 15500 can buy and accumulate banknifty ITM with stop loss.